1-naphthaleneacetic acid (NAA) Herbicide Profile 3/85
CHEMICAL NAME: 1-naphthaleneacetic acid (58)
TRADE NAME(S): NAA 800, Fruitone N, Rootone, Tre-Hold, Stik (56)
FORMULATION(S): 3.5% acid equivalent in a powder base; 5% aqueous
liquid; 1% wt. aerosol can (ethyl ester), 6.34%
acid equivalent in Stik (56).
TYPE: Plant growth regulator
BASIC PRODUCER(S): Union Carbide Agricultural Products Co., Inc.
P.O. Box 12014
T.W. Alexander Dr.
Research Triangle Park, NC 27709
STATUS: General use
PRINCIPAL USES: Inducing root formation on cuttings and
transplants, inducing pineapple flowering, thinning olives, and
otherwise controlling fruit set. Inhibits preharvest apple and pear
drop. Applied as a dust or spray it delays dissolution of the
abscission layer, retarding the fruit drop. Controls regrowth of tree
sprouts after trimming (56).
Ethyl 2-(1-napthyl) acetate is used as a bark paint to reduce
water-shoot production in pruned apple and pear trees and regrowth of
unwanted shoots of some ornamental trees (62).
APPLICATION METHOD(S): Dip basal end of cuttings before placing in
rooting medium. Otherwise foliar spray is the usual application
method. For blossom thinning spray apples 14 to 21 days after calyx
period; pears, 5 to 7 days after petal fall. To reduce preharvest
fruit drop, spray at the first sign of sound mature fruit drop (58).
To be developed.
II. PHYSICAL PROPERTIES
MOLECULAR FORMULA: C12 H10 O2 (58)
MOLECULAR WEIGHT: 186 (58)
PHYSICAL STATE: White crystalline or amorphous powder (pure
compound) (58); colorless liquid (ethyl ester)
ODOR: Odorless (56)
MELTING POINT: 134 to 135 C (pure compound) (58); 125-128 C
(technical grade) (62).
BOILING POINT: 158-160 C/3 mmHg (ethyl ester) (62)
SOLUBILITY: 0.042 g/100 g at 20 C (pure compound) (58);
sparingly soluble in water (ethyl ester) (62).
III. HEALTH HAZARD INFORMATION
OSHA STANDARD: None established
NIOSH RECOMMENDED LIMIT: None established
ACGIH RECOMMENDED LIMIT: None established
A. ACUTE TOXICITY
DERMAL: LD50 (rabbit) = >5,000 mg acid/kg, >5,000 mg
ethyl/ester/kg; slight to moderate irritation to
their skins has been reported on prolonged contact
ORAL: LD50 = c. 1,000 - 5,900 mg acid/kg, c. 3580 mg
ethyl ester/kg (rat); 670 mg a.e. (as sodium
salt)/kg (mouse) (62).
IV. ENVIRONMENTAL CONSIDERATIONS
LC50 (8-day) for mallard duck and bobwhite quail was >10,000
mg/kg diet (62).
V. EMERGENCY AND FIRST AID PROCEDURES
The chemical information provided below has been condensed from
original source documents, primarily from "Recognition and Management
of Pesticide Poisonings", 3rd ed. by Donald P. Morgan, which have been
footnoted. This information has been provided in this form for your
convenience and general guidance only. In specific cases, further
consultation and reference may be required and is recommended. This
information is not intended as a substitute for a more exhaustive
review of the literature nor for the judgement of a physician or other
If poisoning is suspected, do not wait for symptoms to develop.
Contact a physician, the nearest hospital, or the nearest Poison
SYMPTOMS OF POISONING: None evident (58).
FIRST AID AND ANTIDOTES: Treat symptomatically (58).
SKIN CONTACT: If skin affected, wash well with soap and plenty of
EYE CONTACT: If eyes affected, wash well with soap and plenty of
NOTES TO PHYSICIAN:
Antidote: Activated charcoal or egg white solutions (gastric
VI. FIRE AND EXPLOSION INFORMATION
No known incompatibilities. Noncorrosive (58).
VIII. PROTECTIVE MEASURES
STORAGE AND HANDLING: Do not get on skin or in eyes. Always store in
a cool, dry, dark place. Do not spray in strong sunlight; preferably
spray on late afternoon, evening, or at dusk (56).
PROTECTIVE CLOTHING: Wear gloves (56).
IX. PROCEDURES FOR SPILLS AND LEAKS
IN CASE OF EMERGENCY, CALL, DAY OR NIGHT
PESTICIDE TEAM SAFETY NETWORK/CHEMTREC
X. LITERATURE CITED
56. Farm Chemicals Handbook, 70th ed. 1984. R. T. Meister, G. L.
Berg, C. Sine, S. Meister, and J. Poplyk, eds. Meister
Publishing Co., Willoughby, OH.
58. Weed Science Society of America, Herbicide Handbook Committee.
1983. Herbicide handbook of the weed science society of
America, 5th ed. Weed Science Society of America, Champaign,
IL. 515 pp.
62. The Pesticide Manual: A World Compendium, 7th ed. 1983. C.R.
Worthing, ed. The British Crop Protection Council, Croydon,
England. 695 pp.